Glossary of Terms

These terms are used in jewellery making and/or glass fusing. Where the meaning of a term is specific to one of these subjects this will be highlighted. Some terms may have multiple meanings.

CaratA measure of weight used for gemstones. 1 carat = 300 milligrams. The term carat being derived from the carob seeds used by early gem traders on the balance scales. The carob seed being very uniform in size.
FacetOne of the small flat surfaces of a faceted gemstone.
InclusionAn internal flaw in a gemstone that can reduce the clarity.
OctahedronA polyhedron with eight faces, twelve edges, and six vertices
PavilionThat part of a gemstone below the girdle.
PointWhen referring to gemstones, this is a measure of weight. There are 100 points per carat.
PolyhedronA solid in three dimensions with flat polygonal faces, straight edges and sharp corners or vertices.